What constitutes a motor vehicle according to the applicable definitions?

A motor vehicle is defined as any self-propelled vehicle that operates on highways. This definition is broad and typically includes cars, trucks, motorcycles, and other vehicles designed for road use that do not rely on external power sources like railways. The emphasis on being self-propelled indicates that the vehicle has its own means of locomotion, which is a key distinguishing feature compared to other forms of transportation.

The other options do not align with the standard definition of a motor vehicle. For instance, a vehicle that requires a driver's license could include non-motorized vehicles in certain contexts, such as bicycles or specific agricultural vehicles, which may not necessarily be classified as motor vehicles. A vehicle pulled by an animal is clearly not self-propelled and thus does not fit the definition. Similarly, bicycles without motors fall outside the motor vehicle classification, as they lack a self-propelling mechanism and are typically considered non-motorized vehicles.